Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Treasury Stock, Common [Member]	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance as of July 1, 2022		320.9
Balance as of July 1, 2022	$ 5,671	$ 3	$ (469)	$ 1,444	$ 4,776	$ (99)	$ 16
Balance as of July 1, 2022 at Dec. 31, 2020			(17.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	855				855
Less: net income attributable to continuing noncontrolling interest	1						1
Other comprehensive loss	(50)					(50)
Purchase of treasury stock			(12.0)
Purchase of treasury stock	(580)		$ (580)
Restricted Stock Units Vested Shares Net Of Tax Withholdings		0.7
Vesting of restricted stock units, net of shares withheld for employee tax	(4)			(4)
Stock-based compensation expense	25			25
Balance as of September 30, 2022 at Sep. 30, 2021			(29.3)
Balance as of September 30, 2022 at Sep. 30, 2021		321.6
Balance as of September 30, 2022 at Sep. 30, 2021	5,918	$ 3	$ (1,049)	1,465	5,631	(149)	17
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	856
Balance as of July 1, 2022		321.3
Balance as of July 1, 2022	5,895	$ 3	$ (830)	1,459	5,347	(101)	17
Balance as of July 1, 2022 at Jun. 30, 2021			(25.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	284				284
Less: net income attributable to continuing noncontrolling interest	0						0
Other comprehensive loss	(48)					(48)
Purchase of treasury stock			(4.3)
Purchase of treasury stock	(219)		$ (219)
Restricted Stock Units Vested Shares Net Of Tax Withholdings		0.3
Vesting of restricted stock units, net of shares withheld for employee tax	(2)			(2)
Stock-based compensation expense	8			8
Balance as of September 30, 2022 at Sep. 30, 2021			(29.3)
Balance as of September 30, 2022 at Sep. 30, 2021		321.6
Balance as of September 30, 2022 at Sep. 30, 2021	5,918	$ 3	$ (1,049)	1,465	5,631	(149)	17
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	284
Balance as of July 1, 2022		321.6
Balance as of July 1, 2022	5,918	$ 3	(1,049)	1,465	5,631	(149)	17
Balance as of July 1, 2022		321.6
Balance as of July 1, 2022	5,787	$ 3	$ (1,346)	1,474	5,794	(153)	15
Balance as of July 1, 2022 at Dec. 31, 2021			(34.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	955				955
Less: net income attributable to continuing noncontrolling interest	0						0
Other comprehensive loss	(386)					(386)
Purchase of treasury stock			(17.6)
Purchase of treasury stock	(891)		$ (891)
Restricted Stock Units Vested Shares Net Of Tax Withholdings		0.7
Vesting of restricted stock units, net of shares withheld for employee tax	(6)			(6)
Stock-based compensation expense	31			31
Dividends declared to LKQ stockholders ($0.25 per share)	(213)				(213)
Balance as of September 30, 2022 at Sep. 30, 2022			(52.2)
Balance as of September 30, 2022 at Sep. 30, 2022		322.3
Balance as of September 30, 2022 at Sep. 30, 2022	5,277	$ 3	$ (2,237)	1,499	6,536	(539)	15
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	955
Balance as of July 1, 2022		322.0
Balance as of July 1, 2022	5,605	$ 3	$ (1,894)	1,492	6,344	(355)	15
Balance as of July 1, 2022 at Jun. 30, 2022			(45.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	262				262
Less: net income attributable to continuing noncontrolling interest	0
Other comprehensive loss	(184)					(184)
Purchase of treasury stock			(6.8)
Purchase of treasury stock	(343)		$ (343)
Restricted Stock Units Vested Shares Net Of Tax Withholdings		0.3
Vesting of restricted stock units, net of shares withheld for employee tax	(1)			(1)
Stock-based compensation expense	8			8
Dividends declared to LKQ stockholders ($0.25 per share)	(70)				(70)
Balance as of September 30, 2022 at Sep. 30, 2022			(52.2)
Balance as of September 30, 2022 at Sep. 30, 2022		322.3
Balance as of September 30, 2022 at Sep. 30, 2022	5,277	$ 3	$ (2,237)	1,499	6,536	(539)	15
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	262
Balance as of July 1, 2022		322.3
Balance as of July 1, 2022	$ 5,277	$ 3	$ (2,237)	$ 1,499	$ 6,536	$ (539)	$ 15